Port Management
UDLD
155 Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
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STEP 4 Enter the values for the following fields:
• Port—Select the port number to which timeout and priority values are assigned.
• LACP Port Priority—Enter the LACP priority value for the port.
• LACP Timeout—Time interval between the sending and receiving of consecutive
LACP PDUs. Select the periodic transmissions of LACP PDUs, which occur at either a
Long or Short transmission speed, depending upon the expressed LACP timeout
preference.
STEP 5 Click Apply. The Running Configuration file is updated.
UDLD
This section describes how the Unidirectional Link Detection (UDLD) feature.
It covers the following topics:
• UDLD Overview
• UDLD Global Settings
• UDLD Interface Settings
• UDLD Neighbors
UDLD Overview
UDLD is a Layer 2-protocol that enables devices connected through fiber-optic or twisted-pair
Ethernet cables to detect unidirectional links. A unidirectional link occurs whenever traffic
from a neighboring device is received by the local device, but traffic from the local device is
not received by the neighbor.
The purpose of UDLD is to detect ports on which the neighbor does not receive traffic from
the local device (unidirectional link) and to shut down those ports.
All connected devices must support UDLD for the protocol to successfully detect
unidirectional links. If only the local device supports UDLD, it is not possible for the device to
detect the status of the link. In this case, the status of the link is set to undetermined. The user
can configure whether ports in the undetermined state are shut down or merely trigger
notifications.
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